Cutter-head.



tion 3 on the hub 2.

UNITE .Sterns Ancirnrrr @Fisici-4.

SAMUEL JJSHIMER, OF MILTON, PENNSYLVANIA.

CUTTER-HEAD.

SPECIFICATION forming part of Letters Patent No. 668,586, dated February 19, 1901.

ippneaien flied Deeember 5,1900. Aserien Ne. 38.771. j me model.)

.To rtl/f 107mm/ t may concern:

Be it known that I, SAMUEL J. SHIMER, a citizen of the United States,iesiding at Milton, in the county ofv Northumberland and State of Pennsylvania, have invented newand useful Improvements in Cutter-Heads, of which the lollowing is a specification.

My invention relates to expansible cutterheads of the Shimer type; and the objects of the same are to provide simple and efficient means for adjusting the'two head-sections of a cutter head relative to each other to regulate the width of the groove cut by the bits and to provide a locking device to prevent the adjustment being disturbed.

With these objects in view I have designed the novel construct-ion fully described in this specification and claimed and illustrated in the accompanying drawings, forming a part thereof, in which- Figure 1 is an elevation of my improved cutter-head. Fig. 2 is a vertical longitudinal section of the same. Fig. 3 is a detail perspective of the spring locking-ring. Fig'.- 4 is a perspective of a fragment of the adjusting-nut. Fig. 5 is a perspective of the locking-nut.

Like characters of referencedesignate like parts in the diierent views of the drawings.

The letter A designates the lower head-section, which section is provided with a hollow hub 2.- This hub 2 has a lower smooth cylindrical portion 3 and a smaller upper portion 4. A square shoulder 5 is formed at the junction of the portions 3 and 4. For a short distance above the shoulders 5 at 6 the stern 4 is smooth. Next comes a threaded portion 7 and then an upper smooth portion 8. The second or upper head-section is designated by the letter B, and this section has a hub 9 formed integral therewith. The interior bore 10 of the hub 9 tits snugly the smooth por- The hub 9 when the sections A and B abut extends up to a point about one-fourth of an inch below the shoulders 5. This intervening distance 10a is the range of adjustment of the cutter-head and may be varied to suit different sizes of work. Two shoulders or ledges 11 and 12 are formed on the outer contour of the hub 9, and the distance 13 between them is made equal to the distance 10a. Projecting above the ledge 12 is a threaded portion 13which fits an adjusting or carrier nut 14. This adjusting or carrier nut14 is turned out at 15, leaving a rim 16 and aledge or shoulder 17, designed to tsnugly the ledges 11 and 12, respectively, when the cutter-head is expanded to its fullest extent. Just above the shoulder 17 is a threaded portion 18, which ts the before-mentioned Ih readed portion 13 on the section In. This arrangement, in combination with an inwardly-extending flange 19, which fits closely the portion 6 and rests on the shoulders 5, enables the sections A and B to be adjusted relative to each other by means of the n ut 14. rProjecting above the flange 19 is a rim 20, which thus provides a seat for a springring 21 for locking the adj usting-nut in place. This ring 21 is cut by a radial slot 22 and tapers on its under side from apoint diametrically opposite the slot 22 toward one end. A wedge-shaped pawl 23 is located at the smaller end and extends perpendicular to the upper face of the ring. Although the ring 21 is tapering, its upper face is located in a plane perpendicular to the axis-of rotation, which necessitates an intervening space 22a between the flange19 and the spring. Asetscrew 23a firmly clamps the ring 2l in place. A lockingnut 24,which is interiorly screwthreaded, fits the threaded section 7. This nut 24 has an annular projection 25 formed on 4its under face, which projection is cut by a series of radial V-shaped grooves 2o and bears against the ring 21. By this combination of adjusting-nut 14, pawl-bearing spring-ring 21, and a radially-grooved locking-nut 24 the nut 14 is held against accidental displacement by the action of the pawl in engaging the grooves 26, but is at the same time left free to be turned by a slight application of force. Since both the pawlaud groovcs bevel in both directions, the grooves ride over the pawl in both directions. A conical-pointed set-screw 27 lits a threaded aperture 2S in the locking-nut and extends into a recess 29 in the hub 2, and thereby secures the nut in place. In assembling my device the two sections A and B are first put together and the adjusting-n ut 14 slipped on,after which the locknut 24 is scre wed on and secured by the screw 27. The head is now expanded by turning the nut 14 until the desired widthis secured.

lOO

The hubs may be graduated, so that the expansion can be read ofi' directly, or a scale may be supplied which corresponds with the radial grooves in the lock-nut andthe amount ot' expansion determined by counting the clicks t' the pawl and then reading the corresponding distance of'f the scale.

The principal ad\f'antages gained by the construction described is that all longitudinal movement-that is, movement of translation of the adjusting-nut 14, more accu rately termed a carrier-nuW-'is avoided and the relative adjustment of the two sections of the head accomplished by a simple rotation of said nut. Since the nut 14 rests on the shoulder it is held firmly in place by the locking-nut 24, which fits snugly the outer rim of the upper face thereof against every movement hut that of rotation about the hub. The spring-pawl 23 prevents accidental displacement, but permits movement of rotation by a slight. application of force.

Having thus described myinvention, what I claim as new, and Wish to secure by Letters Patent, is-

1. In a cutter-head, the combination, substantially as described, of a first head-section provided with a hub, a second head-section provided with a hub slidingly mounted on the hub of said first section, an adjusting-nut mounted on the hub of said first section and fitting threads on the hub of said second section, and means for locking said adjustingnut against accidental displacement.

2. In a cutter-head, the combination, substantially as described, of a first head-section provided with a hub, a second head-section provided with a h ub slidingly mounted on said first section, an adjusting-nut mounted on said tirst head-section and fitting threads on said second liead-section, a slotted springring bearing a pawl, and a lockingnut provided With grooves which are engaged by said pawl.

3. In a cutter-head, the combination, of a first head-section provided with ahub, a second head-section provided with a hub slidingly mounted on the hub of said first section, an adjusting-nut mounted on the hub of said first section and fitting threads on the huh of said secoudsectiomand means forholding said adjusting-11111; against longitudinal movement but permitting a movement ot' rotation, silbstantially as described.

4. In a cutter-head, the combination, of a first head-section provided with a hub, a secoud liead-section provided with a hub slidingly mounted on the hub of said first section, an adjusting-nut mounted to revolve on the hubof said first section and resting on a shoulder thereon and fitting threads on the hub of said second section, and a locking-nut bear.'- ing on said adjusting-uut. and thereby holding it against all movement but that of rotation, substantially as described.

5. In a cutter-head, the combination, of a first head-section provided with a hub, a sec ond head-section provided with a hub slidingly mounted ou the hub of said first section, an adjusting-lint mounted on the hub of said first section and fitting threads on the hu b of said second section, means for holding said adj nsting-n ut against all movement. but that of rotation, means for holding said adj usting nut against au accidental movement of rotation, substantially as described.

G. In a cutterhead, the combination, sul)- stantially as described, of a first head-section provided with a hub which has a shoulder thereon, a second head-section provided with a hub slidingly mounted on the hub of said firsthead-section,an adjusting-nut having an inwardly-extending tiange which resl s on said shoulder, and threads which tit threads on the hub of said-second head-section, a tapering spring-ring provided with a pawl and secured to said adjusting-nut, and a lock-nut mounted on the hub of said first section and provided with grooves constructed to` be engaged by said pawl.

In testimony whereof I have hereunto set my hand in presence of two subscribing Witnesses.

SAMUEL J. SHIMER.

VVituesses:

W. H. BECK, H. A. KERR. 

